What is this part called?

• Jun 15, 2020

• #1

MisterB

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I already put a new brake proportioning valve and gasket in (the white plastic connected to brake booster), but I'm wondering what the other part is called and what it does?

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• Jun 15, 2020

• #2

Blue Ox

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Check valve?

 

• Jun 15, 2020

• #3

E

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I'm thinking it's a check valve. Hopefully someone can be more specific

 

• Jun 15, 2020

• #4

nabeshin

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That should be it, allows vacuum to be held in the booster so if engine is off or dies, you have some boosted braking left to get to a stop.

My truck doesn't have that anymore, just a plain hose to the manifold.

I think modern boosters have an internal check valve. You can hear the whooshing if you apply brakes with the engine off, then it's gone and the brake pedal gets high and tight.

 

• Jun 15, 2020

• #5

MisterB

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If it's a check valve, I wonder how it differs from the white check valve that's connected to the booster? Makes me wonder if the bigger black one is necessary or not.

Sometimes my brakes behave as though the booster doesn't have enough air to assist with stopping the truck. If I release the brake and apply it again, I typically get full power brakes. I figured it was cheap to replace that white check valve, so why not. Have no idea how old the original one was anyway. Wasn't sure if the other part should be replaced too (or eliminated if not a stock part or necessary)

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• Jun 15, 2020

• #6

dvdswan

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One-way check valve.

 

• Jun 15, 2020

• #7

Rusty Nail

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Air Filter - Booster

34-4309 in LMC

Ohhh its a filter!

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• Jun 15, 2020

• #8

Rusty Nail

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Neat.
Learned somethin.
Booster filter

After you get another one, will you open it up and show us what's inside?

I bet it's got a bronze screen in it with honeycomb shapes like a cat convertor.

Aluminum ring that holds the halves together...

 

Last edited: Jun 15, 2020

• Jun 15, 2020

• #9

RoryH19

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Rusty Nail said:

Neat.
Learned somethin.
Booster filter

After you get another one, will you open it up and show us what's inside?

I bet it's got a bronze screen in it with honeycomb shapes like a cat convertor.

Aluminum ring that holds the halves together...

Click to expand...

Exactly, helps filter the fumes coming off the intake/carb.

 

Last edited: Jun 15, 2020

• Jun 16, 2020

• #10

MisterB

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Rusty Nail said:

Neat.
Learned somethin.
Booster filter

After you get another one, will you open it up and show us what's inside?

I bet it's got a bronze screen in it with honeycomb shapes like a cat convertor.

Aluminum ring that holds the halves together...

Click to expand...

You bet. Thanks for the help

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• Jun 16, 2020

• #11

Rusty Nail

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I think I owed ya one.

 

• Jun 16, 2020

• #12

80BrownK10

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Blue Ox said:

Check valve?

Click to expand...

Yep. Was going to say it, but you are correct as I am sure all the other guys who beat me to it are as well.

But to the OP another one saying check valve.

 

• Jun 16, 2020

• #13

80BrownK10

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80BrownK10 said:

Yep. Was going to say it, but you are correct as I am sure all the other guys who beat me to it are as well.

But to the OP another one saying check valve.

Click to expand...

Well looks like I'm wrong to.

 

• Jun 16, 2020

• #14

Rusty Nail

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:facepalm:
LoL


MisterB now that im thinkin about it, I believe you may be the guy that taught me that trick.

Works good.

BUT! Next time i'll not try to be so damned helpful and post the link, i'll just play it cool like I know a bunch of cool ish like booster filter and ...ish.

Lol?

Lookit thurr

 

Last edited: Jun 16, 2020

• Jun 16, 2020

• #15

hoagster

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F'n crack me up! That filter was pulled off of about 95% of the squares as a pos part long ago!! get a longer vacuum hose and eliminate that pos!